I had sinus problems for 11 years straight. Didn't matter what time of year it was.
I owned a rabbit for 14 years and had fresh hay in the house all the time. Fungus was the culprit.
He died last year, but I still suffered until I started taking 150 mg of Zinc every day (along with following a Pyroluria/Lyme protocol) and in 2 weeks it was totally gone. I mean totally. I swear by it.